console.log('hello geekbang')

exports.hello = 'world'

exports.add = function(a, b) {
    return a + b;
}

exports.geekbang = {
    hello: 'world'
}

setTimeout(function(){
    // console.log(exports)
    console.log(module.exports)
}, 2000);

module.exports = function minus(a, b) {
    return a - b;
}
